Needle weaving loom



March 21, 1939. R. DEWAS NEEDLE WEAVING LOOM 4 Sheets-Sheet 1 Filed Nov. 3, 1937 INVENTOR RAYMOND DEW 5 v ATTORNEYS March21, 1939. R WAS 2,151,085

NEEDLEWEAVING LOOM I Filed Nov. 3, 1937. 4 Sheets-Sheet 2 .INVENTOR RAYMOND [Zf B %k L AT TISRNEYS March 21, 1939. R DEWAS NEEDLE WEAVING LOOM Filed Nov. 5, 1957 4 Sheets-Sheet 4 am w a N m w A,

INVENTOR RAYMOND DE Patented :1 rats PATENT i? 2,151,085 NEEDLE WEAVING LOOM Raymond Dewas, Amiens, France 8 Claims.

llhis invention has for its object improvements in the means for guiding the needles, described in my prior Patent No. 2,125,894 in the case in which each of these needles or weft inserting devices is driven through the instrumentality of The present improvements have mainly for their object to provide, by means which are simple and readily adaptable to weaving looms, a guiding of the propelling device in the four principal opposed directions two by two, inside the channel receiving the inserting device as it issues from the shed, as well as in the shed when it propels the inserting device therein. The aggregate of the guiding means thus obtained by their combination with those provided in my prior patent, produces a reliable operation of this type of inserting device having a non-rigid propelling device, and permits of very high speed operation.

Embodiments of said improvements are described hereinafter and diagrammatically illustrated, merely by way of non-limitative examples, in the accompanying drawings in which: Fig. l is an overall view, on a small scale, in elevation, of the front part of a slay of an improved weaving loorn, the weft inserting devices, or needles, being shown in the position they occupy in the middle of the shed during the exchange of the thread;

Fig. 2 is a fragmentary view, in elevation, of the said slay, showing one of the inserting devices during its travel in the shed;

Fig. 3 is a view in longitudinal section along 3-3 (Figs. 5, 6 and '7), showing the inserting device in its receiving channel;

Fig. 4 is a view in transverse section along 4-4 (Fig. 2);

Figs. 5, 6 and 'I are views in transverse section along 55, 6-6, and (Fig. 3) respectively;

Fig. 8 is a similar view to Fig. 7 and shows a flat needle;

Figs. 9 and 10 are similar views to Figs. 4 and 7, respectively, showing a modification; I

Fig. 11 is a similar view to Fig. 10, showing a flat needle;

Fig. 12 is a similar view to Figs. 4 and 9, showing another modification;

55 Figs. 13 and 14 are views in horizontal section along i3--l3 of Fig. 9 and show two of the bulged shapes the guides may have.

Fig, 15 is a sectional view, similar to Fig. 10, showing improvements in the method of propelling the inserting device; and

Fig. 16 is a sectional view, similar to Fig. 8, showing other improvements in the method of propelling the inserting device.

Each of the inserting devices I (one of which conveys the thread, which unwinds from a large fixed weft bobbin, to the middle of the shed where the other inserting device grasps it and pulls same to the other edge of the cloth) is mounted at the end of a flexible band l4 actuated in known manner by a wheel having teeth or projections l5 which is driven alternately in both directions by the crankshaft, for example, through the intermediary of an appropriate drive of any known kind, and meshing with perforations it provided in the said band. This latter is fixed towards the front end of the inserting device i by means, for example, of rivets l'l passing through a sole 18 provided under the lower face of the arm of the inserting device. The band i l passes through the lower wall of the'channel 8 in a slot is and engages in a curvilinear passage 20 which is fixed, on the one hand to the channel 8, and on the other hand to the lower shaft 32.

According to the invention, the guides 13 provided on the front portion of the slay for guiding the arm of the inserting device I in the shed. are adapted to ensure at the same time the guiding of the flexible band M. For this purpose, each of them is provided with a notch 2! and the aggregate of said notches 2| of the series of guides l3, in combination with the notches 2| of a complementary series of guides l3 arranged opposite the former (and in this case the lower' part of the notches 2| and 2i may consist of one piece) or in staggered relation to same, effects a guiding of the flexible band M in the four principal opposed directions two by two (Fig. 4). Furthermore, the guides l3 and I3 are utilized to ensure the guiding, in the four directions, of the sole l8 interposed between the arm of the inserting device I and the flexible band l4. Said sole I8, thus held in the four directions, by the guides I3 and I3, iormsin this manner an additional guiding and stabili'zing means for the inserting device i when the latter is in the shed.

As regards the guiding of the band I4 in the channel 8, this is effected, likewise in the [our principal opposed directions two by two, by means of a groove 22 of which the upper edges are,

furthermore, utilized for guiding the sole I8 (Fig. 7). The slot I9 (Fig. 6), like the groove 22, also follows the shape of the cross-section of the band ll.

The flat needle shown in Fig. 8 has guide elements similar to those of the needle shown in Figs. 2 to '7, but formed in one piece instead of being separate, the lower part of the channel 8 (the upper part of which is eliminated) being likewise shaped accordingly.

As regards the modification shown in Figs. 9 and 10, it is distinguished from the previous embodiments by the fact that the band It is arranged laterally, and as it is fixed under the horizontal wing of the guide strip 3 placed along the lower portion of the arm ofthe needle I. In this case the guides I3, in addition to their function of guiding the strip 3, furthermore ensure, by means of their groove 24, the guiding of the flexible band I4 in the four principal opposed directions two by two; and still further, by means of their groove 25, they also ensure the guiding of the sole I8 of the needle arm I in three directions; in case of necessity it can be guided in four directions.

(Fig. 10) is provided with grooves 26, 21 for guiding the band I4 and the sole I8.

As to thejiat needle shown in Fig. 11, it has the same guide elements; the channel 8 being shaped accordingly.

The inserting device I shown in Fig. 12 has, in addition to the guide strip 3, another guide strip 3" located on the reed side. By means of the guides I3 and I3, the inserting device I as well as the band are guided in the four directions. In the portion where it is no longer covered by the inserting device, the band I4 is widened until it takes up, in the, notches 2| and 2| of the guides I3; I3, the place which was occupied by the strips 3 and 3", so that the band I4 is guided over its whole length in the four directions. This form of inserting device can utilise a channel 8 of which the upper part is eliminated.

The bulged guide sections shown in Figs. 13 and 14 show respectively a guide of which the maximum thickness of the bulge is located approximately opposite the main apex I3 (Fig. 9), and a guide of which the bulge forms the edge opposite the fell of the cloth. The opening caused in the lower sheet of the divided warp threads by thev introduction of the main apex I3 of such bulged guides is distinctly greater, so that the secondary apex I3 then penetrates in its turn between the warp threads with a further increased safety (as regards the satisfactory division of the threads), and this advantage is obtained without increasing the angle formed by the said threads between the reed and the guides. Y

As regards the band I4, it is preferably formed by two or more superposed bands made of a flexible and light material preferably such as that known in the trade by the name of "Leatheroid", and havingthe advantage of operating without lubrication and of offering a very great resistance to wear on contact with the guides I3 which are preferably made of nitrided steel. The said superposed bands are only secured to each other at, the spot where they are fixed by the rivet or rivets I1, to the front part of the lower face of the inserting device I, whereas over the remainder of their length they are not secured to each other, thereby giving the advantage of enabling them to move rela- The channel 8 tively to each other in the curved portions. A metal band, made of steel for example, can likewise be interposed between two flexible bands made of such a material.

As regards the propulsion of the inserting device, instead of a single wheel I5 having projections as shown in Fig. 3, two wheels can be provided placed one after the other and meshing in the same row of perforations, or again placed one beside the other, the band I4 having in that case two parallel rows of perforations.

According to the improved method of propul- 'sion shown in Fig. 15, the band I 4 which is arranged laterally and fixed under the strip 3, is driven by the wheel I5 meshing with the perforations I6, and a second wheel 23 fast on the same shaft 29 meshes, when the inserting device I is in the channel 8, with a series of recesses 28 provided in the sole I8. This arrangement has the advantage that at high speeds it relieves the band when the inserting device starts operating as it issues from the channel 8 and when it slows down as it enters back into said channel.

For the same purpose, and also for avoiding any tendency of the inserting device I to be lifted under the effect of the under drive by the wheel I5, there is provided, according to the method of propulsion shown in Fig. 16, an upper driving wheel I5 engaging with recesses 30 provided on the upper face of the inserting device I.

Finally, likewise for the same purpose, the projections or teeth of the driving wheel I5 of the band can be made to project beyond the thickness of the said band, the said projections engaging in recesses 3| provided in the element located above the said band and formed either by the sole of the inserting device I, or by the improvements of details can be imagined, and also that the use can be considered of means forming the equivalents of those given as examples. I claim: 1. A needle-guiding mechanism for looms, com prising the combination with a shed, an inserting device movable across the shed, a slay, means connected to said slay and constituting a channel for the inserting device, said channel being positioned adjacent that side of the shed where the inserting device enters, and means connected with said slay and disposed in the front part thereof for the guiding of the inserting device during its travel across the shed; of a flexible propelling member connected with said inserting device, means constituting a part of the firstmentioned means and forming a lower-channel wall having a groove formed therein for the guiding of said flexible propelling member to prevent lateral and vertical movement, and means constituting a part of the second-mentioned means for guiding said flexible propelling member to prevent lateral and vertical movement. 1

2. A needle-guiding mechanism for looms, coma rising the combination with a shed, an insertthe inserting device enters, and means connected with said slay and disposed in the front part thereof for the guiding of the inserting device during its travel across the shed; of a flexible propelling member comprising at least two superposed bands'made of a non-metallic flexible material, means connecting said bands to said inserting device, said bands being secured to each other only at the place where they are connected to the inserting device, means constituting a part of the first-mentioned means and forming a. lower channel wall having a groove formed therein for the guiding of said flexible propelling member to prevent lateral and vertical movement, and means constituting a. part of the secondmentioned means for guiding said flexible propelling member to prevent lateral and vertical movement.

3. A needle-guiding mechanism for looms, comprising the combination with a shed, an inserting device movable across the shed, a slay, means connected to said slay and constituting a channel for the inserting device, said channel being positioned adjacent that side of the shed where the inserting device enters, and means connected with said slay and disposed in the front part thereof for the guiding of the inserting device during its travel across the shed; of a flexible propelling member connected with said inserting device, a sole carried by said inserting device, means constituting a part of the first-mentioned means and forming a lower-channel wall having a groove formed therein for the guiding of said flexible propelling member to prevent lateral and vertical movement, and means constituting a part of the second-mentioned means for guiding said flexible propelling member and said sole to prevent lateral and vertical movement, whereby an additional guiding and stabilizing device for the inserting device is provided when the latter is in the shed.

4. A needle-guiding mechanism for looms, comprising the combination with a shed, an inserting device comprising a strip and movable across the shed, a slay, means connected to said slay andconstituting a channel for the inserting device, said channel being positioned adjacent that side of the shed where the inserting device enters, and means connected with said slay and disposed in the front part thereof for the guiding of the inserting device during its travelacross the shed; or a flexible propelling member connected with said strip, a sole carried by said inserting device, means constituting a part or the first-mentioned means and forming a lower-channel wall having a groove formed therein for the guiding of said flexible propelling member to prevent lateral and vertical movement, and means constituting a part of the second-mentioned means for simultaneously guiding said strip, said flexible propelling member and said sole.

5. The mechanism in accordance with claim 1, comprising a pair of guide strips carried by the inserting device on opposite sides thereof, the means disposed in the front part of the slay for the guiding of the inserting device having notches formed therein for receiving said guide strips, the flexible propelling member having a narrower portion which is connected with the inserting device and a wider portion fitting into said notches when said guide strips are withdrawn therefrom.

6.-The mechanism in accordance with claim 1, comprising a driving wheel engaging the flexible propelling member for driving the same, and complementary propelling means engaging the inserting device for driving the same.

7. The mechanism in accordance with claim 1, wherein the flexible propelling member has openings formed therein, and wherein the inserting device has recesses formed therein and situated above at least some of said openings,

said mechanism comprising a driving wheel having projections adapted to extend through said openings and into said recesses, whereby the flexible propelling member and the inserting device are directly engaged and actuated by said driving wheel.

8. A needle-guiding mechanism for looms,

comprising the combination with a shed, an inserting device movable across the shed, a slay, means connected to said slay and constituting a channel for the inserting device, said channel being positioned adjacent that side of the shed where the inserting device enters, and guides mounted on the front part of the slay for the guiding of the inserting device during its travel across the shed; of a flexible propelling member connected with said inserting device, means constituting a part of the first-mentioned means and forming a lower-channel wall having a groove formed therein for the guiding of said flexible propelling member to prevent lateral and vertical movement, and means constituting a part of the guides for guiding said flexible propelling member to prevent lateral and vertical movement, said guides being or bulged shape in horizontal cross-section.

' RAYMOND DEWAB. 

